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Finding the Fourth Proportional to 788.16, 1,087.20 and 556.32

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Solution

The fourth proportional to 788.16, 1,087.20 and 556.32 is: 767.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.16 : 1,087.20 = 556.32 : x
  2. Step 2: Convert to fraction form
    788.16/1,087.20 = 556.32/x
  3. Step 3: Cross multiply
    788.16x = 1,087.20 × 556.32
  4. Step 4: Simplify right side
    788.16x = 604,831.10
  5. Step 5: Solve for x
    x = 604,831.10/788.16
  6. Step 6: Final answer
    x = 767.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.